Instrument Cluster - Operation

OPERATION

All gauges are the analog type. When the ignition switch is moved to the OFF position, the cluster drives each gauge to its lowest position. The individual gauges in the cluster and gauge pack are not serviceable and require complete replacement of the cluster or gauge pack as an assembly if one or more gauges are inoperable.

The gauges are the magnetic air-core type. When the ignition switch is OFF, the gauge pointers should rest at or below the lowest graduation. The instrument cluster and gauge pack may be checked quickly by using the cluster self-diagnostics Instrument Cluster Self Diagnostics. After bulb check, (with the key in the RUN position and engine running) all MODULE warning indicators (Airbag, ABS, MIL, Charging System, etc.) should be extinguished. If any of these indicators stay ON (excluding seat belt-if unbuckled), use the scan tool to determine module faults. Also refer to the proper body diagnostic information.

NOTE: If any of the gauge pointers are stuck on the wrong side of the pointer stop, perform the instrument cluster self-diagnostic check Instrument Cluster Self Diagnostics. This will "sweep" all the pointers to the correct side of the pointer stop.

One button is used to switch the display from trip to total mileage. Holding the button when the display is in the trip mode will reset the trip mileage. This button is also used to put the cluster in self-diagnostic mode Instrument Cluster Self Diagnostics. Some of the indicators will come on briefly for a bulb check when the ignition is turned from OFF to ON. The LED's are non serviceable and if one or more warning indictor LED's are out, the entire cluster must be replaced.

The bulbs are serviceable. They are the fog lamp, high beam, left and right turn signal, engine ISO symbol, and ABS indicators.

In the event that the instrument cluster looses communication with all other modules on the Programmable Communication Interface (PCI) data bus, the cluster will display "nobuS" in the LCD display. The LCD display also displays odometer trip or total mileage.

The message center indicator lamps are an information system that provides the following messages.

- Airbag indicator: is turned on by the Occupant Restraint Controller (ORC) if a malfunction has occurred that effects the Airbag system. There should also be a Diagnostic Trouble Code (DTC) set in the ORC.
- TPM (Tire pressure monitor) indicator: is turned on by the Body Control Module (BCM).
- ETC (Electronic Throttle Control)indicator: is turned on by the Powertrain Control Module (PCM)
- Antilock Brake indicator: turned on when there is a detected system fault with the antilock braking system. The Controller Anti-lock Brakes (CAB) will store a DTC when this occurs.
- Brake indicator: turned on if parking brake is ON, there is a brake failure due to loss of brake fluid pressure, or low fluid level.
- Front Fog indicator: when the front fog lamps are selected ON.
- High Beam indicator: turned on when the high beam lamps are selected ON.
- Malfunction Indicator (MIL) (ISO Symbol): is turned on by the Powertrain Control Module (PCM). If a malfunction has occurred that effects the emissions system. There should be a diagnostic trouble code set in the memory.
- Seat Belt indicator: turned on when the ignition is turned ON and drivers and passenger seat belt are unbuckled. The lamp is controlled though the Occupant Restraint Controller (ORC).
- Trunk Ajar indicator: turned on when the trunk is not latched. This will only illuminate when the instrument cluster is awake.